Reflecting electric lamp



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H H COLLINS REFLEGTING ELECTRIC LAMP Filed Sept. 15, 1922 Patented Sept.28 1926'.

HAROLD H. COLLINS OF CINCINNATI, OHIO.

BEFLECTING ELECTRIC LAMP.

Application filed September 5, 1922. Serial No. 588,887. r

This invention relates to electric lamps of the filament type and has asone of its primary objects to provide a lamp of this type in whichllightrays which would ordinarily be projected toward the base of the lamp andbe spent without any appreciable illuminating etl'cct, will be reflectedin such a manner as to obtain the full benefit there from.

Generally speaking the invention contemplates'providing within the bulbof an electric lamp of the filament type. a reflector so positioned asto reflect those light rays emanating from the filament which wouldotherwise be projected toward the base of the lamp without any practicalbenefit, and it is another important object of the invention to providethe reflector with a reflecting surface of such contour as to obtain thebest results.

Another important object of the invention is to provide a novelarrangement of the reflector and a novel means for supporting the sameand the filament such as to properly relatively position these partsinthe most stable and substantial manner and to obtain the maximumbenefit from the light rays emanating from the filament.

1n the accompanying drawings:

Figure 1 is a perspective view of an electric filament lamp constructedin accordance with the invention;

Figure 2 is a vertical axial sectional view therethrough takensubstantially on the line 2 2 of Figure 1 looking in the directionindicated by the arrows.

The lamp embodying the invention comprises the usual bulb 1 having theattaching base 2 of any of the usual types and with the terminals ofwhich base are connected the conductor wires or leads 3 which areassociated with the stem of the lamp indicated in general by the numeral4. As is usual, this stem is formed of glass and united in the usualmanner to the base 2, and through: out the upper portion of its lengthit is tubular as indicated by the numeral 5 and houses the upperportions of the conductor wires or leads 3, these wires being suitablyspaced by being passed through spaced perforations in a disc ofinsulating material 6 housed within the said tubular portion of thestem. The lower portion of the stem solid and indicated by the numeral7, and the wires 3 are led laterally in opposite directions through thewall of the tubular portion 5 of the stem immediately above the junctureof said portion with the upper'end of the portion 7, and are'thence leddownwardly at opposite sides of the said portion 7 of the stem, beingspaced and retained in place by a disc 8 of insulating material throughwhich their upper portions are passed and which disc is mounted upon thesolid portion 7 of the stem 4:.

The reflect-or embodying the invention is indicated in general by thenumeral 9 and the same is supported at the lower end of the solidportion 7 of the stem 4. The reflector 9 comprises a body ofsubstantially the form shown in the drawings and having the generalshape of a partly hollow cone, the exterior surface of which constitutesthe reflecting surface and is indicated by the numeral 10. This surfacehas a substantially anticlastic conical contour, that is to say it iscircumferentially convex and longitudinally concave. The reflectingsurface may be provided in any of the customary ways and the reflectorbody 9 as a whole may be integrally connected with the said lower end ofthe stem 7 as for example, by being integrally molded if it, like thestem, is made of glass, the stem being in any event united to the bodycentrally of the depression in its base which renders it partly hollow,and being in axial alinement with said body. It will also be observedthat the body 9 is supported within the bulb with its base presentedtoward the attaching base 2 of the plug and with its apex, indicated bythe numeral 11, presented toward the tip end of the bulb.

The wires 3 are led through the body, 9 of the reflector by being moldedthereimt'or inserted through openings formed therein, as indicated bythe numeral 12, and are brought toward each other with their endslocated as close to each other as is practical. The ends of the portions12 of the conductor wires or leads 3 are electrically connected with theends of an open annular filament 13. The filament 13, due to the closeproximity of its ends, describes substantially a complete circle and thefilament is supported in a plane at right angles to the axis of the stem4 and reflector body 9 and surrounds the said body on a linesubstantially diagonally opposite the central circumferential line ofthe reflectin surface 10. A number of wires 14 are-pro erably employedin supporting the filament 13, the said wires being the base of theanchored at their lower ends to the filament at suitable intervals as at15 and being extended upwardly past and united to or embedded in theedge or peripheral portion of reflector body 9 and above said base beingdirected inwardly at an angle as at 16 and embedded in or united to thesolid portion 7 of the stem 4.

From the foregoing description of the invention it will be evident thatthose rays emanating from the filament 13 and which would ordinarily beprojected upwardly and inwardly or in a more or less upward direction,will not'be expended without benefit inasmuch as they will be reflectedback from the surface 10 of the reflector and projected with the otherrays emanating from the said filament. It will also be evident thatinasmuch as the gap between the ends of the filament is not ofappreciable width or at least is no greater than is practical, therewill be no presence of a dark side when the lamp is energized and infact the filament'may be considered as extending continuously about thereflector body.

Having thus described the invention, what is claimed as new is:

1. In an electric lamp, in combination, a bulb having an attaching base,a stem leading from said base within the bulb, a reflector body of aconical form positioned within the bulb and united to the end of thesupporting stem in a concentric position and with its base presentedtoward the,

said attaching base of the bulb and its apex presented toward the tipend of the bulb, conductor wires associated with the stem and extendingthrough the said reflector body and beyond the outer surface thereofwith their ends located in relatively close proximity, an open annularfilament electrically connected at its ends with the said ends of theconductor wires to receive current therefrom, the said filamentsurrounding the reflector body in a plane above the apex thereof, andsupporting wires radiating from the stem above the reflector body andextendin downwardly past the periphery thereof and united thereto and attheir lower ends united to and supporting the said filament.

2. In an electric lamp, in combination, a bulb having an attaching base,a stem leadstem above the reflector ing from said base within the bulb,a reflector body of a conical form positioned within the bulb andunitedto the end of the supporting stem in a concentric position and with itsbase presented toward the said attaching base of the bulb and its apexpresented toward the tip end of the bulb, conductoriwires associated.with the stem and extending'through the said reflector body and beyondthe outer surface thereof with their ends located in relatively closeproximity, an open annular filament electrically connected at its endswith the said ends of the conductor wires to receive current there from,the said filament surrounding the reflector body, and supporting wiresradiating from the stem above the reflector body and extendingdownwardly past the periphery thereof and united thereto and at theirlower ends united to and supporting the said filament, the reflectorbody having a reflecting surface of anticlastic conical contour.

3. An electric lamp comprising a bulb having an attaching base, a stemof glass anchored to the base and extending within the bulblongitudinally thereof, a disc supported byand surrounding said stem andof insulating material, a reflector body of conical form supported atthe end of the said stem, the said reflector body having a reflectingsurface of anticlastic conical contour, supportingcwires radiating fromthe body and having portions extending downwardly about and past theperiphery of the said body in contact therewith whereby to brace thesaid wires against vibration, an open annular filament supported by thelower ends of the said supporting wires in position surrounding thereflecting surface of the reflector body, the ends of the filament beinglocated relatively close together and the filament being located abovethe lower end or apex of the reflector body, and conductor wires leddownwardly through the said stem, outwardly therefrom in oppositedirections and through the insulating disc, the wires being led throughthe wall of the reflector body and electrically connected with the endsof the filament.

In testimony whereof I aflix my signature.

HAROLDH. COLLINS. [L. s]

